The ratio of the number of green stickers to blue stickers is 9 : 4.
After Adam buys 70 green stickers and 90 blue stickers,
there is an equal number of green stickers and blue stickers.
How many stickers does Adam have now?
|
Green |
Blue |
Before |
9 u |
4 u |
Change |
+ 70 |
+ 90 |
After |
9 u + 70 |
4 u + 90 |
The number of green stickers and blue stickers are equal in the end.
9 u + 70 = 4 u + 90
9 u - 4 u = 90 - 70
5 u = 20
1 u = 20 ÷ 5 = 4
Number of stickers that Adam has now
= 9 u + 70 + 4 u + 90
= 9 u + 4 u + 70 + 90
= 13 u + 160
= 13 x 4 + 160
= 52 + 160
= 212
Answer(s): 212